Drum-screen for fishways.



H. B. JOHNSTON.

DRUM SCREEN FOB. HSHWAYS.

` APPLICATION FILED 213.12, 1907.

1,602,208. Patented Aug. 29, 1911.

2 SHEETSSHEET l.

D A y l @Mmmm u' i" i 1 l H. B. JOHNSTON.

DRUM SCREEN FOR FISHWAYS.

APPIJWMIQN FILED PEB. 12, 1907.

Patented Aug. 29, 1911.

2 SHEBTS-SHBL'E 2.

Unrrnn sii/Aras Par-raar onirica.

HARRY B. JOHNSTON, 0F SALT LAKE CITY, UTAH, ASSIGNOR, BY MESNE ASSIGNMENTS, '10 IVIODEL\1VIANUFACTURING COMPANY, .A CORPORATION OF UTAH.

IIRIJ'M-SCREEN OR FISHWAYS.

Specication of Letters Patent.

Application filed February 12, 1907.

rammed aug. 2e, 1911.

Serial No; 357,050.

To all whomit may concern:

Be it knownthat I, HARRY B. JOHNSTON, a citizen of the Uiiited States, residing at Salt Lake City, in the county of Salt Lake and State of Utah, have invented certain new and useful Improvements 'in ADrum- Screens for Fishways, of which the following is a specification.

My invention relates to. a revolving drum screen for usev in tlumes, streams, fish-ways, or the like, where it is desired to prevent the passage of the fish therethrough but permit a free passage of the water. A

A further object is to so construct the device that it may be easily and cheaply manufactured', will be durable, j. and can beremoved or replaced in the ditch or stream with facility,

In addition to the foregoing advantages the device also permits weeds or other debris to pass over and beyond the same,I and it is at the same time self-cleansing.

In the drawings forming a part of this specification, and in which like symbols of reference represent corresponding parts in the several viewss-Figure. l is a longitudi- 4 nal'section of the device; and, Fig. 2 is-an end elevation, looking in the direction of the arrow, Fig. 1.

1 represents the screen netting of the device; 2 the drum; i5 shaft in same; 4: breakfable folding paddle blades; and l5 a short shaft, carrying bevel gears ,6 and 7, said gear 7 meshing with gear 8 on shaft 3,. The

gear 6 meshes with a large bevel gear 9, and operates the outer drum in a reverse direction to the low of the water. Gear 9 is approximately four times the diameter of bevel gear 6, and is connected to the outside druml. 1() is a key of device.

`11is=a shaft hanger for the purpose of hanging shaft 5 and is attached to an iron brace 12 13 are hinges for paddles, and are for the purpose of Vallowing the paddles to break, fold or bend and thereby prevent any loss of power, by folding inits upward movement, or when it turns against thel stream; 14 are lbolts which hold the iron connecting gear 8 with shaft straps or hangers on the ends of brace 12, and hold said brace. rigidlyvto the lume 16.

15 .represents the iron straps or hangers which are held by said bolts 14 and 16 as before stated is the flume in which the screen is placed. l

17 are the iron braces which hold the screen 1 and drum 2 together; 18 represents the rounded ends of brace 12 on which the outer drum revolves in an opposite direction tothe paddle blades; 22 represents vthe outer ends of brace 12, vwhich are preferably square, to be held firmly to the flume 16; and 19` is the collar which holds the paddle blades on shaft 3. y

20 are circular plates to which the paddle blades are riveted, and which are'attached to the'shaft 3 by collar 19 and gear 8.

21 'represents clear space at sides of paddle blades and side of drum for the purpose of allowing excess of water pressure to pass through the screen wit-hout coming in contact with paddle blades in case of flood or water, 4

The direction of the How of`water is indicated by arrows, which is the same direction as paddle blades turn; and the' direction in which the outside drum turns, the latter being` opposite to that of the former.

The operation of the device will be apparent from the foregoing.

The screen or other drum travels in the opposite direction from that of the paddle wheels, as before explained; and as all the drivingmechanism is protected by being inclosed in the screen there is no obstruction on the outside of the drum whatever, the weeds the water passesthrough the same.

The device will operate in any depth of water with almost equal facility.

Having now fullyv described my invention, what I claimas new and desire to secure by Letters-Patent, is

supporting frame, a shaft journaled in thev same, a gear on saidshaft, a supplemental shaft journaled in the main frame, gears on `said shaft, an outer drum, and a gear on said'druln, the gears of the supplemental 1. In a device of the character described, av

or other debris passing over the drum, while drum and gear of Jthe main shaft.

shaft adapted to engage the gear of the I main shaft by the collar and the hub of the 1 0 bevel gear, and paddle blades connected to 9. In a device of the character described, a the circular plates. main supporting frame, a shaft journaled in -In testimony whereof I ax'my signature f the same, a gear on said shaft, an outer in presenceof two'wtnesses.

drum., a gear on the same, a supplemental l .shaft carrying gears engaging the drum gear and the main shaft gear, circular plates, a collar, said circular plates connected to the HARRY B. JOHNsLO-N. `Witnesses:

C. S, PRICE, EDWARD E. BURNHAM. 

